The last-place Phillies hope his return can provide a spark.
Howard will make his season debut and bat cleanup Friday night in the opener of a three-game set with the visiting Atlanta Braves.
As St. Louis celebrated a 1-0 victory on the field behind him Oct. 8, Howard was being helped to the locker room after tearing his left Achilles' tendon while grounding out to end the series.
After batting .471 with a homer, two doubles and nine RBIs in six minor league rehab games, the slugging first baseman has been activated off the disabled list and is ready to go.
''We think he's ready to play and we want him in the lineup,'' manager Charlie Manuel said. ''We think he can handle it.''
The Phillies could sorely use a boost from Howard right now. They've dropped seven of eight after closer Jonathan Papelbon allowed two runs in the bottom of the ninth in a 6-5 loss to the New York Mets on Thursday.
"You try to stay even keel," Manuel said. "You come out the next day and chip away.''
Howard is batting .327 with six homers in 52 career at-bats off Braves starter Tim Hudson, who will take the mound Friday looking to bounce back from a tough outing.
Hudson (6-4, 3.87 ERA) went 3-1 with a 1.93 ERA in June, but his July got off to a rough start Sunday when he allowed six runs in six innings of an 8-4 loss to Washington.
The right-hander is 1-3 with a 4.30 ERA in six career starts at Citizens Bank Park, but he's 3-1 with a 3.60 ERA in his last six outings overall against the Phillies.
Atlanta (43-39) had lost five of seven before beating the Cubs 7-3 on Thursday. Jason Heyward and Brian McCann each hit a two-run homer in the first inning, and Freddie Freeman and Juan Francisco added solo shots.
Kendrick (2-8, 5.35) fell to 0-4 with a 7.67 ERA over his last five starts after giving up five runs in seven innings of a 5-4 loss to Pittsburgh on June 28.
The right-hander, though, has been solid against the Braves, going 6-1 with a 2.53 ERA in 10 career starts and five relief appearances.
Philadelphia took two of three at Atlanta from May 1-3, and has won nine of the last 10 matchups in this divisional rivalry.
"The Phillies are still the Phillies," Braves manager Fredi Gonzalez told his team's official website. "I don't care if they're 2-110. You go into that ballpark and they sell out, and it's a great atmosphere."